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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b059d7bd4ac0306d23e1a2dcbaf833218b3eb81f1ecca78d823aff61d5aecc1' 
  AND token = 'utXf6tUEAy+5/j++TXsCjBnz8oSVkxOg7llZhMRCryc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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