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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c792bdf5aaf619400ee717c22c5453054380f54af70d0dc558684abc3abf643f' 
  AND token = '6JkGw5bzulpVNa80yT8cjRmJ+rkjioiz7i4SdgSPPRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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