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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97de91916be088d405485f179e58ba66389cadf7c6b38a49b827da7a50f59c22' 
  AND token = 'tf8N9sNXDsuOJh8HqD4ahq0S39jPQAStezMKuYKj6sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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