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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e821f1db2f3f16e1b0de0ae4700fb1644bb6db5bc39dcbdd3a0cc2c0377ca8d' 
  AND token = 'gx1la45XqSk6i89n2Kd/GYviL5NyfH2Gv9A2/RsqSA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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