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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b96fc490f289f3d52f4a301f406f553b41556492f4abc4299027dfb94089d8' 
  AND token = '4Ks+UZ/wRuHna9o2FIKEculNBje/QK0WRhTqi6y1Jyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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