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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b70c4717f774efac7006580b3a8f9feafb2b73c10dcd0d4c756d58c78f32c1' 
  AND token = 'W6vTUXqlnV/9IFmqqtE/cj7qN9gE/rFCNje/NAhXavU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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