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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341cf5a432adddbf99dd0aa56600ca0bd712f50100d5a3f0870758f3a3d6825b' 
  AND token = 'OYJN/AhGNLoISds8f/GmNSglIN/sz/SCD+DF1pUg6iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00496

JSON explain

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