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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37b0459a2fe36fa897c1c777f2c65908bd81e396f6cea025906b9fe674bdbcc' 
  AND token = '4tHgmxmyqx3RKn5TcYovdhS3Fx25u7uqQLN2+CKxlRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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