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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c470f0422bad7c9706b5b2f44ce3406277505ca02f32e166314515298155439' 
  AND token = 'X4zDhE4VUHG7S8sfj1M6ZTMe16szOAF/bdSFO53bdag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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