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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060e3a1929338d43fc758e2fbc513465362aa1cc288682c5031243147f0d839e' 
  AND token = 'ytQBuNvLJKG2le3OCJ7xQ9trp7Xlhelz84LNxm0psR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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