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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d75d8e77cde789e15aba3b49486d483af2a2914a18fb80708cbdb2de06b8ee' 
  AND token = 'crtSHXgorPWedryP5b2hT2nYoSP3sV/pi+8oi1EBAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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