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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfadbc59df3f1e4d324464d49ecd50f954d2cbbd3a21abf2d9e4a222e483f10' 
  AND token = 'bAE5q+8OzCiC+R84iIbds80gRB1PK/2WckmP3v+9B70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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