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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ec6ff6f464f140a0de6cc23c048e00da30ad8ef2765c1c30641bea1f220413' 
  AND token = '2YqyULES7vdiQ2MvJXCVmv2ZXyYHv47wpjWdL9QnH14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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