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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932647439f6db96158fe283e5f82b26f3bada07c8937c4e458d0d9e64d942fe' 
  AND token = 'Bf0IHFOELRM60nokcgDP8i0o3XIRchkXWtD9GRN5l/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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