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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abf098b087ab2b30764ac45dba1b13cee358c06dec7f501e498461b17f4d153' 
  AND token = 'o9R63vvKYmjQDWuJBmdn9hO67CorC1RcyKkYR7P+gRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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