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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87f044a2c556b53defe559eec2143a86863ea756a841e20f48e9d59431bb1f7' 
  AND token = 's3Pf7s9P4ORYjQx67pw+Yuxof2pEa8muwDk4loIsK0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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