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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e238046629d2d88e51e5985f7deaee519875bb40277c7bb6b498be6b807ca3d' 
  AND token = 'GAiEdJ/sqjlSAJJyFHVfl2QG5MjpzQ81smII2DJkQ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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