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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a31a2f0fa4a0dd3ad6cac0ef3e3c92743ad58d73da4a133198f1e6e9997e77' 
  AND token = 'D201nWWMhOstH+kCvgVow0stDnurQGwJ0lVQjMxI42I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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