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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab4356ce2690d18f1c18f9b0406fa54101244d82799261b482c87253c6caa04' 
  AND token = 'Okndj6j8/KT1sVqgzMNZ0uo41BMZIF3j1RyDDM9RMzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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