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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1042d2da9d985cf00910b73c76e668e4e149d6b797ac2799784bbdc101a7c' 
  AND token = 'l2qTdvTg6k2Xy/jc49gbFQ+LVMKPzjc4PmD0ppaFGLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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