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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f753da554c2b0e6d9af1125f2f2bc4c93f6f67c52047b97e47cc2176563172a0' 
  AND token = 'i1YNZUOgfHpm/j7Xr/H8Hoy6eVrZzv5r1Qg5ERiroYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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