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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6ecae35fa796bf296bd486a25e21fd8a390256d2a4aed4c899f739e9cfde77' 
  AND token = '+qp+8dhH+UXoJfw5Q3OWrFxxknhF8hBU/B8z5So5PRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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