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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaaf7821a433ed9f49d472075dfa8978e3d1be983cc9884e54958d8df88f8444' 
  AND token = 'W8zjvahFxfF/sUZ1yxNiK0Xjl0qHV+VxOVoY37DaMxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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