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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe9c3cee1dbce41b1a5ef6635b4e4fb4fec4b5aaec88082774f243da2c48db6' 
  AND token = 'FRSCTvb18e7zufT3CQaImZVA/79zR1VaXvvJroNgGbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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