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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba4dc58ce33c4c53ba1fa7fe16f1ac43929a353bc2309fc32258f157776faaa' 
  AND token = 'h4aBzsj1kiP0Mg9XgsCZ0CT2gmAWbrsQziXM4t+y5Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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