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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1964fdabebb4f3c1c4ff37221845a8bb7093aba2a0812649fcac59c41e15cae' 
  AND token = 'w8GAq5N9B3BHKnK9xs+Ntag6zXvjff61bdqb/+i6rQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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