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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd407bea47e69d83a370033879b724cf6d0f2ca799ab5058f721108a065744955' 
  AND token = 'knLNBFQ60wSHaccA8xB30HSTbao5kuaXpVhDh4rtY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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