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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32487e850d7850a303bc8fda3c6bff0937c015a985b56ce00e8948cb4239a29d' 
  AND token = 'Xc3zbmtRLX7zacky1awjG8W6GIDVVjUeC5BC3Jsa5/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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