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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290a7007be7ab13d695d1b72801b1ee048c0eb63b895e743b04867bd648fcd34' 
  AND token = 'FksVKsv3FjcCwNmlC7eHv3JBeLyRYIPkI0YHwbU4tMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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