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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f3537688a6e78e413c2e6ebbf441b3b6a873d610a375eccf7b71c741719fcb' 
  AND token = '7MCZnxQrCokD0/z80r/Rm+Xgmyt36ipAlUJPZpPR09I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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