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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e900d92445b27ee6350e5c7cb1ebd57e84e6dcb5f4560303400042e1c12a697d' 
  AND token = '+bW6/NCwY990EFCzkWqJMegQYHeT1tXAvvi4tmmLQGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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