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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e832f7a4142c38b045db6f495a7195b17f3d6136b0fd9d2570bef5ad11e3590b' 
  AND token = 'GduZU/VarJrwCCk0V1bnSXjdT5kua/xXBB8H3yE3K6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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