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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c7db9ef26712f331fd4ae0f925ec3e8a468a7060052881992225242f6d569f' 
  AND token = '6pJf2WK1kRq/KujuDDINcbXVkr64+2ZImof3a73Wo6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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