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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915809896f9811e4a3170596a13eb1db670538d0427d2d7a1debb9c776c10b3f' 
  AND token = 'yngHAosL3bTGKqqx5e+dIut6rn7zgxxs4cDjKNPfcaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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