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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32557d3d1a8ff485844911bf39b7eb92dd20b75ac1a05d389e84df8f04b131f2' 
  AND token = 'ARJnxgz5gi60TFbIK5emYjy0/aUGPrib8Gct4gBOEd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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