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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e508adada843823322959cebc9eb3c5ac98c36c11d05f059d7938b6e427f3dae' 
  AND token = 'T3U23xPnUKc9HEcpcHXmvH1BPyMU+8TMuBbc+VKQV74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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