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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f9c128efb313d92086de0d71babd51d56b32fcd08e6e545710e2f297dcf8b0' 
  AND token = 'GhuE/+aAEULkrAQn8QgC0nb6nis5B3XwKPSHwp4H5TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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