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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f65d4a6f08c369478ae463ba70a6ff88e329d8d5f5fe560aa07dc1f70e1c7f' 
  AND token = 'SjXMpPG6fNy2kEH8gG36jglECV17L4VumXFKSLoIkIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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