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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4be6687dca70a0cb8342ae83f5964366962b2a950b75ec72a4f57f38ffaee66' 
  AND token = 'iXTKiClILwn/ySB3aullg37eVBSb8mAJl8TMRs1jfsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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