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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db3716a3554eb40bf583de83e6dcb12136ddc0ab0db5f6c7b9018a9e6cef5e4' 
  AND token = 'gNHazJICil8moyEq2Lg4VYYqOL9fqn0wxGFGndZdrrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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