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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ab8818d8bf61406dc3d6fa30abbd734b0a409f8449b2d83c99dbea2c68bfe2' 
  AND token = 'Mm/3ambOfsa4/eJrQCwOFR6A4/Ildk06c+cNxvUfBus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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