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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7736795a1026c1bfbf860b4e6553eff9593620deb77eba8504c5d67d8ae00d18' 
  AND token = 'Gl+Zxj1be1MYb4Zapw1g1Fj8809a7ZQwe4PZN/CKcIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}