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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab7b9f6d6d48e6328d687e3c4e9ee05d03c60d850f9ea89f0fcfa817c0dd5d5' 
  AND token = 'SkpFYbcNDGgUL5XjCmIsQZUfs6DZqGm+slMODWLtFiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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