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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f0da486e5f6d0e5469bca37a2d0cdafc8f47de3525d8ebf277590d11a57668' 
  AND token = '04FhrBAbERDekdJL4j40yFTKlQlfmzQ9JfQH2kc1Klg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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