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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ce68f1883aa302bc93df4655d7e06369e6ee99a84d40ac06b5cc13577c1b62' 
  AND token = 'k5Nij1A3HuHiII0h6LBEt7CffZ28ECLeamX49AM2TOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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