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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfe827cbe7ee7b97342bbffb28dca383c310c8b241a3bc075c6032f2bfa7f33' 
  AND token = 'Iwa6uv3Lre2S7RnAAgUExPqP8EYxvODRUBzzWx3vCF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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