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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060989136b6f3b5e50d189835e7689552e2a0cef9bcb850102bf06e0dd26d539' 
  AND token = '/dC1ik6rjJ/1Foe23ziuq+mv4h29Ox1hEkTdZE1scfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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