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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8348877d5a2f68e62c30573a579d4202f53c5ba187e17fe63652ef5fddafc36c' 
  AND token = 'SH/oqeO7q/Oqm7QrHxFPUKt6m6HLbakGTEpNQksYqbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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