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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586d7fd6dc0d02de9031fd82194925d632a4528f2aad34ce346d8208aefd1e35' 
  AND token = 'kmV7xBbiCF2IXZzRn4qVJGFRSa3NVnUVtqvOHwsd00s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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