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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30f2b8f5661f902678b81609239121e8f5003169b491efdd65e7c1fa62ec4f5' 
  AND token = 'KZyrAFpTmF859b1L6UX5LIG/AG1Mx1Pz4Pr5XOrO3R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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