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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af35cf894baddad7eea0fc7499e9b49a7e4b61f17489f583f2eb307c6f56807a' 
  AND token = 'oyxBT14OtW4cV5uwtOEscm8+DV80qnpVHm49TcrR/S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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