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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbafac578f4c5c2c2bc8f2eac5658321924f9ee735e2c2318b38ae5ecd7c4e6' 
  AND token = 'payJ2f/BcFxDSluKqcktK7aNbA/6w8UgSuD0n99aa5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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