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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edc4db60f2e2771a1ec1a3a6b26b589c713c8763250f0e77d7293ab3e6d86f5' 
  AND token = 'rpoVuufgjEQnU17Q3KVQ+FagTmYA7hE70PybSaoUQvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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